2 seed hosts 7 seed, 3 hosts 6, and 4 hosts 5 in the Wildcard Round. Divisional round, 1 hosts the lowest remaining seed, and the second highest seed hosts the third. AFC Championship higher seed hosts lower.
Let's say the Bills are the 6 seed. Wildcard round: 2 beats 7, the Bills (6) beats 3, and 4 beats 5.
Now the Bills will travel to the 1 seed in the divisional round. If they win they will travel to the winner of the 2 seed versus 4 seed.
Given that Buffalo will probably not win the division, it's very unlikely we will host a Playoff game.